Yeah, I'd say the de-evolution chair scene and the Club Boom-Boom scene really benefit the most from it. The rest...well, it seems pretty clear the goal here is to include every scrap of footage on the work print, and that's a perfectly valid goal; historical preservation is an end in itself.
But man, there are a whole lot of shots that were cut for good reason -- people parking cars or stepping out of buildings, or repeating the same line they just said. (I always thought the movie's biggest weakness was that they didn't shout "Daisy!" "Luigi!" "DAISY!" "LUIGI!" nearly enough times.)
There's one bit that even has Mario just standing there for several seconds in the middle of a joke, after the setup and before the punchline, killing the timing dead (it's the bit where Luigi says "I know just what to do!", cut to bursting into the apartment and asking Mario for help -- except in this cut we just see Mario standing in the apartment for awhile before Luigi comes in). That sort of fascinates me -- like, why was it cut like that in the first place? Is it customary for a work print to just cut scenes earlier and later, with the expectation that it'll be cleaned up in a later edit? Were they leaving obvious cuts for whatever Disney suits were going to go over it and give notes? Or are the people who made the movie even more inept at filmmaking than I thought?
But there are a lot of spots that benefit from added continuity or just a little breathing room. And it was nice to see more of the creature work -- I love the Goombas and Yoshi; like pretty much all the design in this movie, it's totally wrong but really beautifully-designed.
It's always been clear from looking at the production design that they wanted to make Brazil but wound up with a movie that was subject to so much studio meddling that it was unrecognizable as the film they set out to make.
Or, to put it another way, they wanted to make Brazil and succeeded beyond their wildest expectations.